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Avogadro's Number

Defines concept of the mole as a counting unit

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Using Avogadro's Number

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Avogadro's Number

Amedeo Avogadro provided the unit of measurement called the mole (mol), or the amount of a substance that contains 6.02 x 1023 particles of that substance. How many water molecules are in a mole of water molecules?

Avogadro's number (6.02 x 1023) is the number of representative particles in a mole. What is a representative particle? Can molecules be representative particles?

Click here to help you answer the questions about Avogadro's number.

Conversions Between Moles and Atoms

You can use dimensional analysis to convert moles to particles and vice versa.

Remember: 1 mole = 6.02 x 1023 atoms or particles.

License: CC BY-NC 3.0

Two water molecules contain 4 hydrogen atoms and 2 oxygen atoms. A mole of water molecules contains 2 moles of hydrogen atoms and 1 mole of oxygen atoms. [Figure1]

How many moles of helium atoms is 4.72 x 1024 atoms of helium?

How many hydrogen atoms are in a mole of water (H2O) molecules? How many oxygen atoms?

Remember your significant figures!

You can check your answers and find more information about conversions between moles and atoms here.

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  1. [1]^ License: CC BY-NC 3.0


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